Coal-mining machine



(No Model.)

B. F. WILSON. COAL MINING MACHINE.

Patented Aug. I

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UNITED STATES PATENT OFFICE.

BENJAMIN F. WVILSON, OF PITTSBURG, PENNSYLVANIA.

COAL-MINING MACHINE.

SPECIFICATION forming part of Letters Patent No. 502,426, dated August1, 1893.

Application filed August 30, 1892. Serial No. 444,567. (No model.)

To a/ZZ whom t may concern.-

Be it known that I, BENJAMIN F. WILSON, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements in CoalMining Machines; and4 I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to an improved coal mining machine and consists incertain details of construction, and combination of parts as will befully described hereinafter.

In the accompanying drawings, Figure 1 is a plan view of myimprovedmining machine, having a portion of the top removed the better to showthe lower working parts. Fig. 2 is a sectional side elevation of thesame, and Fig. 3 is afragmentary face View of the driving mechanism.

To put my invention into practice, I provide a frame 1, and mount insuitable bearings 3, a threaded shaft 2 which extends the entire lengthof the said frame. Operating on the top of this frame 1, and capable ofInoving in the direction of the length of the same is a carriage 23,having mounted therein a threaded shaft 17, arranged at right angles tothe shaft 2 of the other frame. Attached to one end of this shaft 17, isa cross-head 8, mounted on slides 9 attached to the carriage 23. Securedto a downward extension of this cross-head is an arm 18, having a socketin which a cutting tool 19 is attached. This threaded shaft passesthrough a stationary nut 10, formed on the carriage, and through asleeve 11, on which a loose toothed wheel13 is mounted. This wheel 13,has a clutch formed on one side of the hub which is adapted to engagewith a fixed clutch l2, operated by a hand-lever 27. This clutch may bealso engaged with a large gear Wheel 15, mounted on a feather in amanner that will permit the shaft 17 to move freely through the saidwheel. Meshing with this gear Wheel 15 is a pinion 16 mounted on a shaftattached to an extension 23X of the frame of the carriage 23. Thispinion 16 is operated by sprocket wheels 25, and 26 connected to a motor24, mounted on the top of the carriage 23. The toothed wheel 13 beingloose meshes with another toothed wheel 14 of the same size connected tothe same shaft as the sprocket wheel 2G, and the said wheels 13-14,serve to operate the screw shaft in an opposite direction to the motiongiven the same when connected by the clutch 12, to the large gear wheel15, which is also loosely collar-ed on screw 17 and pinion 16 on thecounter-shaft. Operating on the threaded shaft 2, which remainsstationary, is a ratchet wheel 4 adapted to be slightly rotated at everybackward movement of the crosshead S. This rotation of the ratchet 4 isaccomplished by means of a pawl 5, pivoted to a weighted lever 6, comingin contact with an inclined surface 7, attached to the cross-head 8.

The cutting tool 19 having a chisel point is moved backward by throwingthe clutch in gear with the wheel 13, which rotates the same to operatethe screw shaft 17. A small hole which will permit the cutting tool 19to enter, is first drilled in the coal, at the left hand end of theroom, and at a point close to the floor. This hole will give the cuttingtool a starting place, and by engaging the clutch 12, with the gearwheel 15 the said tool cuts a thin strip from the edge of the said hole,and when entered the full depth of the same the clutch is shifted toengage with the reversing gearing 13--14. On the backward movement ofthe cross head 8 the lever 6 engages with the inclined surface 7;elevating the said lever, which operates the pawl 5, and wheel 4 to movethe carriage slightly forward to cut another thin strip from the side ofthe opening, and the operation as described continued until the coal isundermined across the entire room.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

The herein described coal mining machine, consisting of the frame 1, thethreaded shaft 2 mounted thereon, the carriage 23, operating along saidframe, the shaft 17 having athreaded portion and attached to thecross-head 8, the gearing 15--16 for operating said shaft to drive thetool forward, the gearing 13-14 to reverse the movement of the saidshaft 17,

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the clutch 12 to engage with the hubs of said hereunto affix mysignature this 27th day of gearing, a motor 24 mounted ou the top ofAugust, A. D. 1892. the carriage and means substantially as del scribedfor feeding the carriage evenly along BENJAMIN F' WILSON' [L' S'] 5 theframe, all arranged for service substan- In presence 0ftially as setforth. JOHN S. KENNEDY,

In testimony that I claim the foregoing I M. E. HARRISON.

